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AP Biology: Tuesday, 11/22/11 Intro to Photosynthesis. Homework: Chapter 10 Reading Worksheet – take notes on this for tomorrow Do Now: Hand in PS 9 Answer the following in your notebook: Which stage of cell respiration do you think EVOLVED first? Why? - PowerPoint PPT Presentation
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AP Biology: Tuesday, 11/22/11Intro to Photosynthesis
Homework: Chapter 10 Reading Worksheet – take notes on this for tomorrow
Do Now: Hand in PS 9 Answer the following in your notebook:
Which stage of cell respiration do you think EVOLVED first? Why?
What do you know about the summary equation for photosynthesis? Can you write it? How does it relate to the equation for cell respiration?
Goals for Today: Explain the order of evolution of methods for using and making
sugar Identify the pigments and light wavelengths necessary for
photosynthesis, and use an absorption spectrum to explain which wavelengths of light best promote photosynthesis
Evolution of glucose pathways:
1. Glycolysis – slow, makes a little ATP from the glucose in the “primordial soup”
2. Photosynthesis Creates lots of glucose to fuel glycolysis Creates oxygen…
3. Aerobic Cell Respiration
Photosynthesis
Carbon dioxide + Water + Sunlight energy
Glucose + Oxygen
Photosynthesis:Sunlight meets Chlorophyll
Visible Light SpectrumPigmentsChlorophyllAbsorption Spectrum
Goals: Identify the pigments and light wavelengths
necessary for photosynthesis Use an absorption spectrum to explain which
wavelengths of light best promote photosynthesis
In a group of 3-4:
Choose a scribe to record answers. Discuss and write down:
1. Why are plants green?2. Which color(s) of light would result
in the most photosynthesis?3. Which color(s) would result in the
least photosynthesis?4. How could you set up an
experiment to test this?
AP Bio: Wednesday, 11/23/11Photosynthesis
Homework: PS 10 due Thursday after break
Do Now: Take out the Photosynthesis Reading Worksheet Get back and look over your quiz
Goals for Today: Describe the details of the two stages of
photosynthesis How light energy is converted into chemical energy How that energy is used to make glucose
Summary of Photosynthesis:
Overall equation:
6CO2 + 6H2O + sunlight energy C6H12O6 + 6O2
reduction
oxidation
cuticle
upper epidermis
lower epidermis
Photosynthesis
electron carrier
electron carrier
electron carrier
Phase 1: The Light Reactions
Phase 1: The Light Reactionsstroma
thylakoid space
PS II PS I
ATP synthase
cytochromes(electron transport proteins) NADP+
reductase
e-
LIGHT
e-e-H2O ½ O2
+ 2 H+
e-e-e-e-
e-e-
H+
H+
H+
ADPPi
ATP
NADP+NADPH
to Calvin Cycle
LIGHT
Summary of Light Reactions:
• Water splits to donate electrons, and releases oxygen as waste
• Light excites electrons to flow through ETC made of chlorophylls (photosystems) and cytochromes
• ATP and NADPH are made (for use in the Calvin cycle)
Phase 2: Calvin Cycle
Phase 2: Calvin Cycle
Summary of Calvin Cycle:
• Carbon (from CO2) is fixed by the enzyme Rubisco
• Most fixed carbon is used to regenerate RuBP (the CO2 acceptor that starts the cycle)
• Some fixed carbon is used to make a 3-carbon sugar that can form…– glucose (used for cell resp. or stored as starch)– sucrose (transported through rest of plant)[This is the whole point of photosynthesis!]
Photosynthesis Video
AP Bio: Monday, 11.29.10Photosynthesis: Challenges & Adaptations
Homework: PS 10 due tomorrow
Do Now: Read the Background Info and answer questions 1-2 on the
handout Goals for Today:
Describe photorespiration and explain why it’s bad for plants Explain how C4 and CAM photosynthesis get around the
challenge of photorespiration Agenda:
Do Now Quick explanation of photorespiration Work in groups on C4 or CAM If time: Present on C4 or CAM. If not, tomorrow.
Photorespiration –
The process in which the enzyme Rubisco fixes oxygen instead of carbon dioxide (in the first step of the Calvin cycle) Due to Rubisco’s lack of specificity (it
can use O2 or CO2 as a substrate) Happens when stomates are closed(high O2 concentration and low CO2
concentration) Wasteful – uses ATP and NADPH from
light rxns, but makes no sugar!
Photosynthesis: Challenges & Adaptations
Goals for Today: Describe photorespiration and explain why it’s
bad for plants Explain how C4 and CAM photosynthesis get
around the challenge of photorespiration In Groups of 3:
Use a textbook to figure out how C4 or CAM works to circumvent photorespiration
Answer the questions on your assigned page Every member of your group should be
ready to explain this to the class!
AP Bio: Tuesday, 11.30.10Photosynthesis: Challenges & Adaptations
Homework: Lab 4 Pre-Lab (read procedure and answer pre-lab questions)
Do Now: (in your mind or your notebook) What photosynthesis adaptation did your group study? Both of these adaptations separate the initial step of carbon
fixation from the actual Calvin cycle. Does your adaptation separate these things temporally or spatially?
Goals for Today: Explain how C4 and CAM photosynthesis get around the
challenge of photorespiration Agenda:
C4 and CAM presentations Pre-Lab for Lab 4
AP Bio: Wednesday, 12.1.10Lab 4: Rates of Photosynthesis
Homework: Lab 4 Graph and Analysis Questions
Do Now: Take out Lab 4
Goals for Today: Predict and measure how _____ and __________ affect
rates of photosynthesis Explain how our experimental setup allows us to do
this Agenda:
Review Pre-Lab and experiment set-up Set up chloroplast suspension Do the lab!
Lab Groups for Today:
Set up tubes now and come back 3rd or 4th period: Gina Shannon Elaine
Sayed Yanira Alex
Surendra
Wilmene
Sohaila
Wilanda
Tracy Leo
Elias Hanna
h Eliza
Betsie Juliana
Peter Ned
John Camer
on Maria
AP Bio: Thursday, 12.2.10Cell Energetics Wrap-Up & Review
Homework: Study for Test on Cell Respiration & Photosynthesis
Do Now: Sit with your lab group from yesterday (but at the
desks and front tables) Take out Lab 4 Volunteers draw graphs on the board
Goals for Today: Explain the results of the photosynthesis lab Compare and contrast cell respiration and
photosynthesis Review Cell Energetics by playing Jeopardy!
Compare/Contrast CR and P-sis
In your notes, with your lab group:
Make a list or table in which you brainstorm all the similarities and differences between photosynthesis and cellular respiration Include:▪ Broad Concepts▪ Specific Details
AP Bio: Monday, 12.6.10Test on Cellular Energetics
Homework: Chapter 35 Reading Notes
Do Now: Look over PS 10 Get ready for the test
Goals for Today: Demonstrate knowledge of cell respiration and
photosynthesis by answering AP-style multiple choice and open response questions
Agenda: Quick review of PS 10 Test
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